Total Desperatjon

Upon 1 or more Allies being dropped to 0 hp in combat, a 30 foot sphere of energy explodes from the caster and deals 5d10 radiant damage to all enemies within this sphere, in turn knocking them away from the caster and out of this 30 foot sphere, doing an additional d6 damage if an enemy is thrown into an object from this force.  After casting this spell the caster enters a state of exhaustion until they receive healing or take a short rest.  An additional 1d10 is added for every additional ally beyond the first to fall to 0 Hp.  This damage does not affect allies in any way.